#include "SeqList.h"

void SLInit(SL* ps)
{
	ps->arr = NULL;
	ps->size = 0;
	ps->capacity = 0;
} 



void SLDestroy(SL* ps)
{
	if (ps->arr)
	{
		free(ps->arr);
	}
	ps->arr = NULL;
	ps->size=0;
	ps->capacity = 0;
}

//void SLPrint(SL s)
//{
//	for (int i = 0; i < s.size; i++)
//	{
//		printf("%d ", *(s.arr + i));
//	}
//	printf("\n");
//
//}

void SLCheckCapacity(SL* ps)
{
	if (ps->capacity == ps->size)
	{
		int newCapacity = ps->capacity == 0 ? 4 : 2 * ps->capacity;
		SLDataType* tmp = (SLDataType*)realloc(ps->arr, sizeof(SLDataType) * newCapacity);
		if (tmp == NULL)
		{
			perror("realloc fail!");
			exit(1);
		}
		ps->arr = tmp;
		ps->capacity = newCapacity;
	}
}

void SLPushBack(SL* ps, SLDataType x)
{
	assert(ps);
	/*if (ps->capacity == ps->size)
	{
		int newCapacity = ps->capacity == 0 ? 4 : 2 * ps->capacity;
		SLDataType* tmp = (SLDataType*)realloc(ps->arr, sizeof(SLDataType) * newCapacity);
		if (tmp == NULL)
		{
			perror("realloc fail!");
			exit(1);
		}
		ps->arr = tmp;
		ps->capacity = newCapacity;
	}*/
	SLCheckCapacity(ps);
	ps->arr[ps->size++] = x;

}

void SLPushFront(SL* ps, SLDataType x)
{
	assert(ps);
	/*if (ps->capacity = ps->size)
	{
		int newCapacity = ps->capacity == 0 ? 4 : 2 * ps->capacity;
		SLDataType* tmp = (SLDataType*)realloc(ps->arr, sizeof(SLDataType) * newCapacity);
		if (tmp == NULL)
		{
			perror("realloc fail!");
			exit(1);
		}
		ps->arr = tmp;
		ps->capacity = newCapacity;
	}*/
	SLCheckCapacity(ps);
	for (int i = ps->size; i >0 ; i--)
	{
		ps->arr[i] = ps->arr[i - 1];
	}
	ps->arr[0] = x;
	ps->size++;
}


void SLPopBack(SL* ps)
{
	assert(ps);
	assert(ps->size);
	ps->size--;
}


void SLPopFront(SL* ps)
{
	assert(ps);
	assert(ps->size);
	for (int i = 0; i < ps->size-1; i++)
	{
		ps->arr[i] = ps->arr[i + 1];
	}
	ps->size--;
}


//void SLInsert(SL* ps, int pos, SLDataType x)
//{
//	assert(ps);
//	assert(pos >= 0 && pos <= ps->size);
//	SLCheckCapacity(&ps);
//	for (int i = ps->size; i>pos; i--)
//	{
//		ps->arr[i] = ps->arr[i - 1];
//	}
//	ps->arr[pos] = x;
//	ps->size++;
//}

void SLErase(SL* ps, int pos)
{
	assert(ps);
	assert(pos >= 0 && pos < ps->size);
	for (int i = pos; i <ps->size-1; i++)
	{
		ps->arr[i] = ps->arr[i + 1];
	}
	ps->size--;
}

//int SLFind(SL* ps, SLDataType x)
//{
//	assert(ps);
//	for (int i = 0; i < ps->size; i++)
//	{
//		if (ps->arr[i] == x)
//			return i;
//	}
//	return - 1;
//}